Effects of swirl and skew upon supersonic wall jet in crossflow

The results of an experimental investigation of the effects of swirl and skew on the mixing of a supersonic light gas jet injected from a flat wall into a supersonic airstream are presented. Tests were at nominally equal injectant mass flow rate, total pressure, and injector nozzle exit static pressure. Data include surveys of cross-sectional planes of the flow for several different cases of swirl and skew using cone static pressure, pitot, stagnation temperature, and gas sampling probes (with gas analysis system). The results are analyzed to determine mixing efficiency and lateral motions of the center of the injectant plume. The effect of combined swirl and skew on injectant mixing is to slightly increase mixing in the near field of injection, but there is little effect of either swirl or skew on mixing far downstream. Both swirl and skew slightly reduce penetration.